\documentclass{article}
\usepackage[x11names, rgb]{xcolor}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usetikzlibrary{snakes,arrows,shapes}
\usepackage{amsmath}
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\begin{document}
\pagestyle{empty}
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\enlargethispage{100cm}
% Start of code
% \begin{tikzpicture}[anchor=mid,>=latex',line join=bevel,]
\begin{tikzpicture}[>=latex',line join=bevel,]
  \pgfsetlinewidth{1bp}
%%
\begin{scope}
  \pgfsetstrokecolor{black}
  \draw (102bp,17bp) node {$C_1$};
\end{scope}
  \pgfsetcolor{black}
  % Edge: CORR1 -> STAIR1
  \definecolor{newcol}{rgb}{0.0,1.0,0.0};
  \pgfsetcolor{newcol}
  \draw [->] (118bp,109bp) .. controls (129bp,99bp) and (143bp,85bp)  .. (162bp,67bp);
  % Edge: CORR1 -> SHAFT1
  \pgfsetcolor{black}
  \draw [] (87bp,109bp) .. controls (74bp,97bp) and (56bp,79bp)  .. (44bp,67bp);
  % Edge: CORR1 -> JANCL1
  \draw [] (103bp,106bp) .. controls (103bp,95bp) and (103bp,81bp)  .. (103bp,70bp);
  % Node: JANCL1
\begin{scope}
  \pgfsetstrokecolor{black}
  \draw (103bp,52bp) ellipse (29bp and 18bp);
  \draw (103bp,52bp) node {JAN\ CL};
\end{scope}
  % Node: CORR1
\begin{scope}
  \pgfsetstrokecolor{black}
  \draw (103bp,124bp) ellipse (27bp and 18bp);
  \draw (103bp,124bp) node {CORR};
\end{scope}
  % Node: SHAFT1
\begin{scope}
  \pgfsetstrokecolor{black}
  \draw (28bp,52bp) ellipse (28bp and 18bp);
  \draw (28bp,52bp) node {SHAFT};
\end{scope}
  % Node: STAIR1
\begin{scope}
  \definecolor{strokecol}{rgb}{0.0,1.0,0.0};
  \pgfsetstrokecolor{strokecol}
  \draw (177bp,52bp) ellipse (27bp and 18bp);
  \pgfsetstrokecolor{black}
  \draw (177bp,52bp) node {STAIR};
\end{scope}
%
\end{tikzpicture}
% End of code

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\end{document}
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